Professor of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi-221005.

Professor of Biochemistry, Universidad Nacional Autonoma deMexico

Professor of Microbiology, University of Alabama at Birmingham

Professor of Microbiology, University of Illinois at Urbana-Champaign

Microbiology and Immunology, University of Western Ontario, London, Ontario CANADA

University of Saskatchewan

Professor of Chemistry, Wayne State University

University of Guelph

Universidad de Costa Rica

Privatdozentin, University of Lübeck